Try this commands to fix this issue:
gconftool-2 --type boolean --set /desktop/gnome/interface/buttons_have_icons true gconftool-2 --type boolean --set /desktop/gnome/interface/menus_have_icons true
Try this commands to fix this issue:
gconftool-2 --type boolean --set /desktop/ gnome/interface /buttons_ have_icons true gnome/interface /menus_ have_icons true
gconftool-2 --type boolean --set /desktop/